Lock



March 2 1926.

N. B. HURD LOCK Filed March 27, 1925 2 Sheets-Sheet l Swuentoz elf tom a March 2 1926.

N. B. HURD LOCK Filed March 2'7, 1925 2 Sheets-Sheet 2 Patented Mar. 23, 1926.

UNITED TATES PATENT orries;

NORM-An B, from), or new nmrnrmoonnnorlcur, AssIenoaro THE AMERICAN" HARDWARE conronn'rrorugor NEW'BRITAIN, CONNECTICUT, A 'ooizrona'rron'or CONNECTICUT.

LOCK.

Application 'filed March 27, i925. sr'i'al'no. 18,750.

To-nllwhomitmag concern:

Be it knoivn that I, NORMAN B. Hem, a citizen o'f tl1e United States of America, residing at New Britain, Connecticut, have invented a new and useful Look, of which the following is a specification.

My invention relates to a lock particularly, though not exclusively, adapted for use on hotel doors and the like.

It is an object of the invention to provide a lock which when locked from the inside when a door bearing the lock is closed may not be unlocked fromthe outside except by means of a special emergency key, and if locked from the inside While the door is open, the mere closing of the door will positi on the lock parts so that the door may be unlocked from the outside by an ordinary y- It is a further object to provide a lock in which tumbler dogging means may be movably mounted in the lock case so as to be movable to an inoperative and an operative position. t 1

It is a further object to provide a lock in which a stump or fence may be movably mounted and controlled by means such as an auxiliary latch.

Other objects will hereinafter appear.

Briefly stated, in the preferred form of the invention I employ a lock having a latch or the like and Within the lock case is provided means for locking the latch in projected position. The locking mechanism within the case may be such that When a door is locked from the inside the locking parts are moved to such positions that 'an ordinary or maids key, for example, may not be effective to enter a room from the outside but an emergency key may be successfully employed for that purpose. Means such as a tumbler serves to dog or block the locking mechanism in the forward or projected position and in order to dog the tumbler I employ a tumbler, dogging means such as a stump or fence which is movably mounted in the case so as to be movableto an operative and an inoperative position. prefer to control the movablestump bymeans such as an auxiliarylatch which may move or mit movement of the same toanopera'tive position when the auxiliary latch is retracted a b the, .st i en e d vl el m rl or rniit movement of the movable Stump In the draivings which show, for illustrative purposes only, a preferred form of the invention: I ig, 1 is a view in sidee'ley ation of a lock ivith the cover removed and illustrating the parts position to be opened'from the outside by jan ordinary key; I

ig. 2 is vieiv similar to Fig. l I but illustrating the positionsfof the parts When the door has been locked from the inside but the door being in open position, that is, the

latch members out of contact With the strike plate; v

Fig. 3is an isometric view'ofa lock case and certain interior parts relatively separatedfor the sake of clear illustration;

Fig. '4 'is a sectional view taken substanmay in the plan'e of the line 4L of Fig. 1;

Fig. 5 is an inside en'd vieiv of a cylinder lock which may be employed on the outside ofthe door;

I 6 is a view similar to Fig. 5 but illustrating parts in a different position, In said drawings, 1 indicates a lock case having a face plate 2 thereon, Suitable door latching i'n'eans suchfas a latch 3 may extend through the faceplate 2 and may be retracted as by means of the usual yoke 41 and door knob roll back In the preferred form the roll back 5is connected only to the inside knob and tire outside knob, if one be provided would be dead and would serve merely as a convenient handle, 'an' d would no'tbe co nected to the latch retractin mechanism. 5 y ei l'oyja eboltfi's lidable ii; 5 1? s e' e a iv 'ee op a Pi J i i t g. b S t- 8-. .T 'l e S i bolt may also have a seco1 1s1pe9 positioned ,ove' a pin M an auxili ry latch -lever 1OL t o l b ed. T lower jend 'of. the

to engage behind the plate or lug 12 on the latch bolt so that when the slide bolt is in the position indicated in Fig. 1 the latch bolt will be free to be moved to retracted position and with the slide bolt in the position shown in Fig. 2 the latch bolt will be locked against retractile movement.

A suitable tumbler 13 may be mounted upon the slide bolt as by means of the aperture 14: and lug or pin 15 projecting from the slide bolt. The slide bolt may have a notch 16 therein to receive a. projection 17 on the free end of the tumbler 3. A. sprii'ig 18 serves to urge the tumbler in a counterclockw'se direction as viewed in the drawings and this movement is limited by the projection 19 at one side of the notch 16 on the slide bolt. The tumbler 13 is gated as by means of a. lug 2O thereon which lug engages av suitable stun-1p or fence. Now i-n the usual form of lock, the fence or stump cooperating with the tumbler to dog the same is cast integrally with or fixedly secured to the lock case. In the present instance, however, the stump or tumbler dogging means 21 which cooperates with a tumbler projection is movably mounted in the case.

In the form shown I employ what may be termed a stump lever 22 pivoted as by means of a pin 23 in the lock case and carrying the stump 21 at the other end. This stump lever I prefer to control by means of an auxiliary latch mechanism having a purpose to be later described. 24 is a lever pivot-ally mounted in the case on the pin 25. An auxiliary latch 26 is secured to the lever 2d and moves with it. A spring 26 serves to urge theanxiliary latch 26 to the outward or projected posi tion. In the form shown the auxiliary latch carrying lever 24 has a cam surface 27 which when the auxiliary latch is being retracted and consequently moving; the lever 2 t toward the right as viewed in sev eral figures. rides up on the tumbler stump 21 or the cam surface 28 on the lever 22. hen the auxiliary latch 26 is moved toward the left as view-ed in the drawings by means of the spring 26, the rear side of the latch lever 24; engages a projection on the stump lever 22 and thus serves to elevate the stump 21 to an inoperative position. for example, as shown in Fig. 2.

Now it will be seen that when the auxiliary latch is in retracted position as shown in Fig. 1. the cam surface 27 will have depressed the stump 21 to an operative posilion in front of the tumbler lug 20 and the slide bolt 6 will then be held in the retracted position shown in Fig. 1. lVhen the door carrying this lock is closed it is obvious that the auxiliary latch being in engagement with the strike plate will re-" main in re ra d. P i n a Ste e in Fi bolt and the parts carried thereby.

1. Now it the slide bolt should be moved to the locking position indicated in Fig. 2 while the door is open there would be nothing to hold the auxiliary latch retracted and the stump 21 would then be elevated to an inoperative position as shown in Fig. 2. In this position, therefore, the tumbler and slide bolt would not be dogged and the mere act of closing the door against the strike plate would cause the latch 3 to act through the latch bolt and plate 12 to engage the finger 11 and thus retract the slide The various parts would then again occupy the positions shown in Fig. 1.

Now. as has been stated, the outside, door knob is merely a handle and does not at. any time serve to withdraw the latch From the outside latch 3 is always retracted by a suitable key. In the form illust 'ated, the slide bolt may carry a lever 30 pivoted on the pin 15 and extending over the end 31 of a lever 32 which may be pivoted on a pin 38, carried by the slide bolt. The lower end of the lever 32 engages behind the plate 12 and it will be evident that when the lever 30 is depressed, the latch bolt will be retracted.

Now referring particularly to Fig. i, 35 indicates a cylinder lock screwed into the lock case from the outside and carrying a cam or roll back 36 on the plug of the lock cylinder as will be understood. The roll back 36' is slotted and carries a plate 37 having a button or auxiliary roll back 38 which may be moved to either of the positions shown in Figs. 5 or 6. lVhen a maids key or a guest key is inserted in the plug of the cylinder lock 35, the plate 37 will not be moved for the reason that such key is too shor: to extend through the plug and beneath the plate 37. The button 38 will therefore ren'iain in its extreme inward position shown in Fig. 5. lVith the auxiliary roll back 38 in the position shown in Fig. 5, the same will be in a position to on go the top of the lever 30 when the parts are positioned as shown in Fig. 1. The roll back 36 and auxiliary roll back 38 may therefore be actuated by a guest or maids key to depress the lever 30 and through the lever 32 retract the latch bolt so that the door may be entered.

Referring now again to Fig. l. *10 indicates an inside cylinder lock carrying a plug with an inside roll back 41 which is in position at. all times to engage the projection 17 on the tumbler 13 for depressing the same and is also in position to engage the sides of the notch 16 in the slide bolt for moving the same. Now when the door has been entered and closed, the guest. key may be inserted in the inside cylinder lock -11.- and the plug turned was to cause the roll back 41 to first depress the pro ection 17 from the position shown 1n Fig. 1 so as to disengage the tumbler projection from the stump 21, which is now held in operative position as shown in Fig. 1; further rotation then of the inside key will cause the roll back to move the slide bolt 6 toward the left as viewed in Fig. 1 until it reaches the position shown in Fig. 2 with the roll back 41 brought up against a suitable stop 42 carried by the casing. During this movement it will be observed that the levers 30, 32 have been carried along toward the left with the slide bolt. In the position shown in Fig. 2 the levers 30, 32 would be completely out of the path of movement out the roll backs on either the inner or outer cylinder plugs. lt will thus be plain that if the niaids key be inserted in the outside cylinder, the plug may be freely rotated completely around without engaging the lever and since only the auxiliary roll back 38 extends over the tumbler projection 17, the same would not be depressed.

Now in case 0t emergency, a door locked from the inside may be entered with the aid of a special emergency key which is made long so as to extend through the plug ofthe outside cylinder 35 and elevate the plate 37 and the auxiliary roll back 38 to the position shown in Fig. 6. \Vith the auxiliary roll back 38 in such projected position if the plug now be turned, the auxiliary roll back will ei'igage the tumbler projection 17 and will move the same downwardly so as to disengage the projection 20 from the stump 21 and further rotation will cause the auxiliary roll back 08 acting against the right hand side of the notch 16 to again move the slide'bolt back to the position shown in Fig. 1, and upon a still further rotation the auxiliary roll back will engage the top of the lever 30 and as previously described will retract the latch Vith the parts again in the extreme right hand position as viewed in Fig. 1 either the guest or the maids key may be used to enter the door from the outside.

lVhile the invention has been described in some detail and specific illustrations of its use defined, I do not wish to be confined to the form of lock herein shown, since the invention as delined in the appended claims may be variously embodied, however, I wish to lay particular stress upon dogging means such as the stump which is movably mounted instead of being forming integrally with the lock case as is the usual practice.

I claim:

1. In a look, a lock case, a latch in said case, a slide bolt in said case for locking said latch in projected position, a tumbler carried by said slide bolt for locking the same in one position, and a stump cooperating with said tumbler for dogging the same in one position, said stump being movably mounted so as to be movable to an operative and an inoperative position.

2. In the combination defined in claim 1, and an auxiliary latch means for cooperation with said stump for moving the same to an operative position when the auxiliary latch is retracted.

3. In a lock, a lock case, door locking mechanism therein, a stump movably mounted in the case for dogging said door locking mechanism in locked position, and an auxiliary latch for moving said movably mounted stump into position to dog said door locking mechanism.

ea. In a lock, a lock case, door locking mechanism therein, a stump for dogging said door locking mechanism, and an auxiliary latch means for cooperation with said movably mounted tumbler stump and serving to move the same to an operative position when the auxiliary latch is in one extreme position and to an inoperative position when the auxiliary latch is in the other extreme position. v

5. In a lock, a lock case, door locking mechanism therein, a stump movably mounted in said'case and adapted when in one position to dog said door locking mechanism, and an auxiliary latch means for moving said stump to an inoperative position when the auxiliary latch is in projected position.

6. In alock, a lock case, door locking mechanism therein, a lever pivotally mounted in said case and carrying a stump for dogging said door locking mechanism and auxiliary latch means for cooperation with said lever carrying said stump for controlling the position of same.

NORMAN B. HURD. 

